Develop Reference

Dynamically set XML URI at runtime - XSLT option

I have a number of Java classes that I am using in conjunction with JAXB in order to generate XML. The java classes have minimal changes from year to year but the output XML needs to have very specific yearly changes to it and it's proving a little elusive. I've tried updating the attributes using DOM but nodes further along the tree are maintaining the previous state. I've tried using reflection to update the annotations directly before marshalling but it doesn't seem to be having the desired effect. I've also tried replacing the XMLRootElement object (and XMLType, XMLElement) with local classes but nothing seems to be working properly as some information always seems to be retained somewhere even when it seems that I have changed the member/attribute/etc.
I am not going to duplicate all the java objects on a yearly basis just so that I can change the namespaces to match the requirements.
Right now I'm at the point where I think XSLT might be the last option but I have little to no knowledge of it. Is there a simple way to update 5-8 namespace URI's that are located on the root element? I don't want to change the prefixes (they are already set using a prefix mapper), I just want to change the namespace from "com.help.me.2014" to "com.help.me.2015".
Thanks
Andy
Resolution:
First off I greatly appreciate the effort and responses. I didn't actually try any of them as I came up with a different solution prior to getting back to see them.
Anyone coming along in the future can try the items listed below (as an XSLT solution) or you can try what I describe below.
I am generating XML in two different styles/formats, one with and one without SOAP wrappers. Due to my difficulty accessing the actual namespaces within the DOM/SOAP objects and my inability to alter the annotations at runtime I ended up capturing the output stream and manipulating the resulting string.
SOAP:
ByteArrayOutputStream stream = new ByteArrayOutputStream();
soapMessage.writeTo(stream);
String file = new String(stream.toByteArray);
... manipulate file (now a string), replace values, etc. -> actually passed to dependency injected converters, then send on to client via response.write
JAXB Marshalling is very similar to the SOAP, both send the resulting String onto converters which manipulate it as a StringBuilder then send it on.
Thanks again for the suggestions. Hopefully it helps someone in the future although the requirement is a little out there.
Andy

Changing namespaces every year is almost certainly the wrong thing to do, but the following XSLT stylesheet will change namespaces
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:old="oldspace"
version="1.0">
<xsl:template match="old:*">
<xsl:element name="{local-name(.)}" namespace="newspace">
<xsl:apply-templates select="#*|node()"/>
</xsl:element>
</xsl:template>
<xsl:template match="#old:*">
<xsl:attribute name="{local-name()}" namespace="newspace">
<xsl:value-of select="."/>
</xsl:attribute>
</xsl:template>
<xsl:template match="*">
<xsl:copy select=".">
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="#*">
<xsl:copy-of select="."/>
</xsl:template>
<xsl:template match="processing-instruction()|comment()">
<xsl:copy-of select="."/>
</xsl:template>
</xsl:stylesheet>
This style sheet creates a copy of every element changing the namespace from oldspace to newspace when appropriate. Other than the namespace change, the original document is preserved. Similar templates can be made for every namespace that needs to be changed (note there are two templates that are namespace specific).
Note that prefixes WILL be altered. These are not really content as such, so it is nearly impossible to preserve them in a case like this. The only way I can think of to preserve those would involve writing a separate template for each element in the original, directly creating the new elements instead of using the xsl:element element.
For example, the given xml
<os:myroot xmlns:os="oldspace">
<?keep-this?>
<os:testing abc='3' def='9'>
<!-- This is a child -->
<os:item>1234</os:item>
</os:testing>
<!-- this element is in the default namespace -->
<testing2>
<abc>112233</abc>
</testing2>
</os:myroot>
is transformed to
<myroot xmlns="newspace">
<?keep-this?>
<testing>
<!-- This is a child -->
<item>1234</item>
</testing>
<!-- this element is in the default namespace -->
<testing2 xmlns="">
<abc>112233</abc>
</testing2>
</myroot>
where all elements that were in the oldspace namespace are now in the newspace namespace.

Here's an option that allows you to pass the old and new namespace URIs in as xsl:params.
XML Input (Borrowed from Matthew's answer; thanks!)
<os:myroot xmlns:os="com.help.me.2014">
<?keep-this?>
<os:testing abc='3' def='9'>
<!-- This is a child -->
<os:item>1234</os:item>
</os:testing>
<!-- this element is in the default namespace -->
<testing2>
<abc>112233</abc>
</testing2>
</os:myroot>
XSLT 1.0
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:param name="oldns" select="'com.help.me.2014'"/>
<xsl:param name="newns" select="'com.help.me.2015'"/>
<xsl:template match="#*|node()" name="ident">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="*" priority="1">
<xsl:choose>
<xsl:when test="namespace-uri()=$oldns">
<xsl:element name="{name()}" namespace="{$newns}">
<xsl:apply-templates select="#*|node()"/>
</xsl:element>
</xsl:when>
<xsl:otherwise>
<xsl:element name="{name()}" namespace="{namespace-uri()}">
<xsl:apply-templates select="#*|node()"/>
</xsl:element>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
XML Output
<os:myroot xmlns:os="com.help.me.2015"><?keep-this?>
<os:testing abc="3" def="9"><!-- This is a child -->
<os:item>1234</os:item>
</os:testing><!-- this element is in the default namespace -->
<testing2>
<abc>112233</abc>
</testing2>
</os:myroot>
Here's an XSLT 2.0 option that produces the same output...
XSLT 2.0
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:param name="oldns" select="'com.help.me.2014'"/>
<xsl:param name="newns" select="'com.help.me.2015'"/>
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="*" priority="1">
<xsl:element name="{name()}" namespace="{
if (namespace-uri()=$oldns) then $newns else namespace-uri()}">
<xsl:apply-templates select="#*|node()"/>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
Here's another 2.0 example that handles multiple namespace uris. The old and new uris are passed in as a string with commas as delimiters.
The order of the uris are important. The first old uri corresponds to the first new uri. The second old uri corresponds to the second new uri. Etc.
XML Input (updated to have more than one namespace uri)
<os:myroot xmlns:os="com.help.me.2014">
<?keep-this?>
<os:testing abc='3' def='9'>
<!-- This is a child -->
<os:item>1234</os:item>
</os:testing>
<!-- this element is in the default namespace -->
<testing2>
<abc>112233</abc>
</testing2>
<os2:testing xmlns:os2="com.help.me.again.2014">
<os2:item>ABCD</os2:item>
</os2:testing>
</os:myroot>
XSLT 2.0
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:param name="oldns" select="'com.help.me.2014,com.help.me.again.2014'"/>
<xsl:param name="newns" select="'com.help.me.2015,com.help.me.again.2015'"/>
<xsl:variable name="oldns-seq" select="tokenize($oldns,',')"/>
<xsl:variable name="newns-seq" select="tokenize($newns,',')"/>
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="*" priority="1">
<xsl:variable name="nsIdx" select="index-of($oldns-seq,namespace-uri())"/>
<xsl:element name="{name()}" namespace="{
if (namespace-uri()=$oldns-seq) then $newns-seq[$nsIdx] else namespace-uri()}">
<xsl:apply-templates select="#*|node()"/>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
XML Output
<os:myroot xmlns:os="com.help.me.2015"><?keep-this?>
<os:testing abc="3" def="9"><!-- This is a child -->
<os:item>1234</os:item>
</os:testing>
<!-- this element is in the default namespace -->
<testing2>
<abc>112233</abc>
</testing2>
<os2:testing xmlns:os2="com.help.me.again.2015">
<os2:item>ABCD</os2:item>
</os2:testing>
</os:myroot>

XSLT 1.0: how to wrap XML element around other templates?

I am using xsltproc to process XSLT 1.0 transform on OS X Yosemite; input is HTML, and output is XML.
The idea is that the templates below matching h1[#class='page-header'] and div[#class='mixins'] actually work, but the problem is wrapping them in a custom parent XML element (here called dye).
I realize my template matching * is broken; it's there simply to illustrate the kind of structure I would like to output.
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes" method="xml"/>
<xsl:strip-space elements="*"/>
<xsl:template match="node()|style|script"/>
<xsl:template match="*">
<xsl:element name="dye">
<xsl:apply-templates select="h1[#class='page-header']"/>
<xsl:apply-templates select="div[#class='mixins']"/>
</xsl:element>
</xsl:template>
<xsl:template match="h1[#class='page-header']">
<xsl:element name="color">
<xsl:value-of select="text()"/>
</xsl:element>
<xsl:text>
</xsl:text>
</xsl:template>
<xsl:template match="div[#class='mixins']">
<xsl:element name="tone">
<xsl:value-of select="p/a[#class='tone']/#href"/>
</xsl:element>
<xsl:text>
</xsl:text>
</xsl:template>
</xsl:stylesheet>
Thanks for your interest!

I believe this should work:
<xsl:template match="*">
<dye>
<xsl:apply-templates select="h1[#class='page-header']"/>
<xsl:apply-templates select="div[#class='mixins']"/>
</dye>
</xsl:template>

Producing html xslt from xsl:fo

I'm tring to transform an xsl:fo into xslt (for HTML output). Then, I would apply xslt instead of xsl:fo obtaining the HTML output instead of a PDF.
How can do this?
I need API for XML Processing, or JAXP that transforms XML and XSL to another output. So, I tried to write the xslt template:
<xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:fo="http://www.w3.org/1999/XSL/Format" exclude-result-prefixes="fo"
>
<xsl:template match="/xsl:template[#match='/root']/fo:root">
<xsl:apply-templates select="fo:page-sequence"/>
</xsl:template>
<xsl:template match="fo:page-sequence">
<xsl:for-each select="fo:flow[#flow-name='xsl-region-body']">
<xsl:call-template name="xsl-regional-body">
<xsl:with-param name="fontsize"><xsl:value-of select="#font-size"/></xsl:with-param>
</xsl:call-template>
</xsl:for-each>
</xsl:template>
<xsl:template name="xsl-regional-body">
<xsl:param name="fontsize" />
<body>
<xsl:if test="$fontsize"> <!-- costruisce <font size=""> -->
<font>
<xsl:attribute name="size">
<xsl:value-of select="$fontsize"/>
</xsl:attribute>
</font>
</xsl:if>
<xsl:for-each select="*/xsl:choose">
<xsl:call-template name="xsl-choose"/>
</xsl:for-each>
<xsl:apply-templates select="."/>
</body>
</xsl:template>
<xsl:template name="xsl-choose">
<xsl:value-of select="."/>
</xsl:template>
I obtain something like
<body><font size="10pt"/>
...
text words..
</body>
But it delete all xsl:choose xsl:when and other tags like
I need all these tags because i need to pass xml data in second pass using Jaxp and producing html..
I would obtain
<body><font size="10pt"/>
<xsl:choose>
<xsl:when test="ddx[#id='LET.....>
<xsl::value-of select="ddx[#id='Lx']/r/PE...>
</xsl:when>..
</xsl:choose>
text words..
</body>
How can get the XSL nodes like text node?

If you want to use XSLT to output XSLT elements (i.e. elements in the XSLT namespace) then you need to use a namespace alias as shown in http://www.w3.org/TR/xslt#literal-result-element:
<xsl:stylesheet
version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:fo="http://www.w3.org/1999/XSL/Format"
xmlns:axsl="http://www.w3.org/1999/XSL/TransformAlias">
<xsl:namespace-alias stylesheet-prefix="axsl" result-prefix="xsl"/>
<xsl:template match="/">
<axsl:stylesheet>
<xsl:apply-templates/>
</axsl:stylesheet>
</xsl:template>
<xsl:template match="block">
<axsl:template match="{.}">
<fo:block><axsl:apply-templates/></fo:block>
</axsl:template>
</xsl:template>
</xsl:stylesheet>

i put xsl: code between < ! CDATA [... ] ] >
anyway using another namespace

Replace xmlns attribute of root node using xslt

I have xml like below
<rnp xmsns="v1">
<ele1 line="1">
<ele2></ele2>
</ele1>
</rnp>
I want to change it to
<rnp xmsns="v2">
<ele1 line="1">
<ele2></ele2>
</ele1>
</rnp>
using xslt 1.0.
I am using below xsl.
<?xml version="1.0" encoding="iso-8859-1"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns="v2">
<xsl:template match="*">
<xsl:element name="{local-name()}">
<xsl:apply-templates select="#*|*|node()"/>
</xsl:element>
</xsl:template>
<xsl:template match="rnp">
<rnp>
<xsl:apply-templates select="*"/>
</rnp>
</xsl:template>
</xsl:stylesheet>
But this xsl does not copy the attributes so line attribute is not generated in output.
sample output
<?xml version="1.0" encoding="UTF-8"?><rnp xmlns="v2"><ele1>1
<ele2/>
</ele1></rnp>
How to change only the text of xmlns attrbiute using xslt? Is there any other way to change xmlns using xslt? I have only option of xslt 1.0.
Thanks.

This transformation:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:param name="pNS" select="'v2'"/>
<xsl:template match="node()|#*">
<xsl:copy>
<xsl:apply-templates select="node()|#*"/>
</xsl:copy>
</xsl:template>
<xsl:template match="*[true()]">
<xsl:element name="{local-name()}" namespace="{$pNS}">
<xsl:apply-templates select="node()|#*"/>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
when applied on the provided XML document (corrected to make it in the namespace "v1":
<rnp xmlns="v1">
<ele1 line="1">
<ele2></ele2>
</ele1>
</rnp>
produces the wanted, correct result:
<rnp xmlns="v2">
<ele1 line="1">
<ele2/>
</ele1>
</rnp>
Do note:
The desired new default namespace is passed to the transformation as an external parameter -- thus the smae transformation without any modification can be used in every case when the default namespace must be modified.
This unusual looking template match: <xsl:template match="*[true()]"> makes it possible to avoid the XSLT processors "recoverable ambiguity error" messages if we had coded it just as <xsl:template match="*"> and is shorter and more elegant than specifying a priority.

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns="v2">
<xsl:output method="xml" indent="yes"/>
<xsl:template match="#* | node()">
<xsl:copy>
<xsl:apply-templates select="#* | node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="*">
<xsl:element name="{local-name()}">
<xsl:apply-templates select="#* | node()"/>
</xsl:element>
</xsl:template>
</xsl:stylesheet>
Output:
<rnp xmlns="v2">
<ele1 line="1">
<ele2 />
</ele1>
</rnp>

xslt help - remove empty tags and replaces * with empty tags

I am having a problem while doing some XSLT pre-processing in my java program.
We get an asterisk (*) from a mainframe program when it wants to blank out a value, which my java process has to treat like a blank or empty tag. So we apply an xslt to the input before my jaxb process.
We are applying this xslt :
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="no"/>
<xsl:template match="#*[. = '*']">
<xsl:attribute name="{name()}" namespace="{namespace-uri()}">
<xsl:text></xsl:text>
</xsl:attribute>
</xsl:template>
<xsl:template match="*[. = '*']">
<xsl:copy>
<xsl:text></xsl:text>
</xsl:copy>
</xsl:template>
<xsl:template match="#* | node()">
<xsl:copy>
<xsl:apply-templates select="#* | node()"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
The above xslt works fine for ALMOST all test cases.
Except in the case where there is only ONE sub-element and that happens to be an asterisk.
For instance consider this in the input:
<MYROOT><Address3><Line2>*</Line2><Line3>*</Line3></Address3></MYROOT>
works well.
It produces this output:
<MYROOT><Address3><Line2/><Line3/></Address3></MYROOT>
The xml input below, however , produces an incorrect response.
<MYROOT><Address4><PermanentAddress><Line2>*</Line2></PermanentAddress></Address4></MYROOT>
But instead of giving the response as
<MYROOT><Address4><PermanentAddress><Line2></Line2></PermanentAddress></Address4></MYROOT>
It gives this:
<MYROOT/>
Please help. Any help is appreciated as I did not have this test case while testing my code.

That's because . is the inner text, which is a concatenation of all inner text nodes. You need to make sure in your condition that there is no child node either or only a text node with * as contents.
This should work:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="no"/>
<xsl:strip-space elements="*"/>
<xsl:template match="*[not(*) and (. = '*')] | #*[. = '*']">
<xsl:copy />
</xsl:template>
<xsl:template match="#* | node()">
<xsl:copy>
<xsl:apply-templates select="#* | node()"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>

Replace:
<xsl:template match="*[. = '*']">
<xsl:copy>
<xsl:text></xsl:text>
</xsl:copy>
</xsl:template>
with
<xsl:template match="*[not(*) and not(text()[2])]/text()[.='*']"/>
This is much more efficient than having to calculate the string value of every element, because the string value of an element is the concatenation of all its descendent text nodes.